package main
import (
	"fmt"
)

func Sum(a,b int) int{
	return a+b
}


func swap(a,b int)(int,int){
	return b,a
}

func main(){
   
	sum:=Sum(10,10)
	fmt.Println(sum)

	a:=10
	b:=20
	a,b = swap(a,b)
    
	fmt.Printf("a==%d,b==%d\n",a,b)

}